Steering Column Tilt/Telescoping Malfunction

Steering Column Tilt/Telescoping Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The steering column has a tilt/telescoping control system that consists of an electronic control module capable of LIN message communication, a steering column power assembly with positioning motors and sensors, and a steering column control switch. The column position module will wake up with the tilt/telescope steering column switch. No DTCs or data is available. Vehicle symptoms will cause the customer to bring the vehicle in for service.

The tilt/telescope steering column has a four-position switch. The switch may be used to adjust the position of the steering wheel rearward or forward which is telescope and up or down which is tilt. The position of the column may be changed as follows:

* Press the switch up to tilt the column up.

* Press the switch down to tilt the column down.

* Press the switch forward and the column moves toward the front of the vehicle.

* Press the switch rearward and the column moves toward the rear of the vehicle.

Two position sensors are Hall Effect sensors and are used by the column position module. The column position module provides a 5 V reference voltage and a ground to both the tilt and telescoping position sensors. The sensor feedback circuit voltage varies from 0-5 V. Each sensor is part of the motor assembly. The column position module monitors the feedback voltage to determine the column position.

Reference Information

Schematic Reference

Tilt/Telescoping Steering Column Schematics Tilt/Telescoping Steering Column Schematics

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

Steering Wheel and Column Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Circuit/System Verification

1. Ignition ON.

Note: Operate the steering column switch in each direction for more than 1 second.

Note: When performing the following tests, make sure that the steering column is not already in the position the test is attempting to produce.

2. Verify the steering column directional motors listed below operate while operating the S71 steering column tilt and telescope switch in all directions.

* M65 Steering Column Telescope Motor

* M68 Steering Column Tilt Motor

• If the steering column telescope motor moves for only.5 seconds FORWARD or REVERSE

1. Wait 5 seconds.

2. Operate the S71 steering column tilt and telescope switch FORWARD and REVERSE.

• If the M65 steering column telescope motor moves for only.5 seconds FORWARD or REVERSE, replace the M65 steering column telescope motor

• If the steering column telescope motor does not operate FORWARD and REVERSE
Refer to Circuit/System Testing - Steering Column Telescope Motor Control Circuit Test.

• If the steering column tilt motor moves for only.5 seconds UP and DOWN

1. Wait 5 seconds.

2. Operate the S71 steering column tilt and telescope switch UP and DOWN.

• If the M68 steering column tilt motor moves for only.5 seconds UP or DOWN, replace the M68 steering column tilt motor.

• If the steering column tilt motor does not operate UP and DOWN
Refer to Circuit/System Testing - Steering Column Tilt Motor Control Circuit Test.

• If both the tilt and telescope motors operate

3. All OK.

Circuit/System Testing

Steering Column Telescope Motor Control Circuit Test

1. Ignition OFF, disconnect the harness connector at the S71 steering column tilt and telescope switch.

2. Test for less than 10 ohms between the ground circuit terminal G and ground.

• If 10 ohms or greater

1. Ignition OFF.

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K99 steering column control module.

• If less than 10 ohms

3. Ignition ON, test for B+ between the signal circuits listed below and ground:

* Terminal A

* Terminal F

• If less than B+

1. Ignition OFF, disconnect the X4 harness connector at the K99 steering column control module.

2. Test for infinite resistance between the signal circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K99 steering column control module.

• If B+

Note: When performing the following test, make sure that the steering column is not already in the position the test is attempting to produce.

4. Install a 3 A fused jumper wire between the signal circuits listed below and the ground circuit terminal G. Verify the steering column telescopes FORWARD and REVERSE to the soft stop.

* Terminal A

* Terminal F

• If the steering column telescope motor does not operate

1. Ignition OFF, disconnect the X2 harness connector at the K99 steering column control module.

2. Test for 6-1.0 ohms between terminal 1 and terminal 2.

• If not within the specified range
Replace the M65 steering column telescope motor.

• If within the specified range

5. Ignition OFF, disconnect the harness connector at the S71 steering column tilt and telescope switch.

6. Test for infinite resistance between the ground terminal G and each signal terminal at the S71 steering column tilt and telescope switch with the switch in the open position.

• If less than infinite resistance
Replace the S71 steering column tilt and telescope switch.

• If infinite resistance

7. Test for less than 2 ohms between the ground terminal G and each signal terminal at the at the S71 steering column tilt and telescope switch with the switch in the appropriate closed position.

• If 2 ohms or greater
Replace the S71 steering column tilt and telescope switch.

• If less than 2 ohms
Replace the K99 steering column control module.

Steering Column Tilt Motor Control Circuit Test

1. Ignition OFF, disconnect the harness connector at the S71 steering column tilt and telescope switch.

2. Test for less than 10 ohms between the ground circuit terminal G and ground.

• If 10 ohms or greater

1. Ignition OFF.

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K99 steering column control module.

• If less than 10 ohms

3. Ignition ON, test for B+ between the signal circuits listed below and ground:

* Terminal B

* Terminal C

• If less than B+

1. Ignition OFF, disconnect the X4 harness connector at the K99 steering column control module.

2. Test for infinite resistance between the signal circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K99 steering column control module.

• If B+

Note: When performing the following test, make sure that the steering column is not already in the position the test is attempting to produce.

4. Install a 3 A fused jumper wire between the signal circuits listed below and the ground circuit terminal G. Verify the steering column tilts UP and DOWN to the soft stop.

* Terminal B

* Terminal C

• If the steering column tilt motor does not operate

1. Ignition OFF, disconnect the X1 harness connector at the K99 steering column control module.

2. Test for 6-1.0 ohms between terminal 1 and terminal 2.

• If not within the specified range
Replace the M68 steering column tilt motor.

• If within the specified range

5. Ignition OFF, disconnect the harness connector at the S71 steering column tilt and telescope switch.

6. Test for infinite resistance between the ground terminal G and each signal terminal at the S71 steering column tilt and telescope switch with the switch in the open position.

• If less than infinite resistance
Replace the S71 steering column tilt and telescope switch.

• If infinite resistance

7. Test for less than 2 ohms between the ground terminal G and each signal terminal at the S71 steering column tilt and telescope switch with the switch in the appropriate closed position.

• If 2 ohms or greater
Replace the S71 steering column tilt and telescope switch.

• If less than 2 ohms
Replace the K99 steering column control module.

Component Testing

Steering Column Tilt/Telescope Switch Test

1. Ignition OFF, disconnect the harness connector at the S71 steering column tilt and telescope switch.

2. Test for infinite resistance between the ground terminal G and each signal terminal with the S71 steering column tilt and telescope switch in the open position.

• If less than infinite resistance
Replace the S71 steering column tilt and telescope switch.

• If infinite resistance

3. Test for less than 2 ohms between the ground terminal G and each signal terminal with the S71 steering column tilt and telescope switch in the appropriate closed position.

• If 2 ohms or greater
Replace the S71 steering column tilt and telescope switch.

• If less than 2 ohms

4. All OK.

Steering Column Telescope Motor Test

1. Ignition OFF, disconnect the X2 harness connector at the K99 steering column control module.

2. Test for 6-1.0 ohms between terminal 1 and terminal 2.

• If not within the specified range
Replace the M65 steering column telescope motor.

• If within the specified range

3. All OK.

Steering Column Tilt Motor Test

1. Ignition OFF, disconnect the X1 harness connector at the K99 steering column control module.

2. Test for 6-1.0 ohms between terminal 1 and terminal 2.

• If not within the specified range
Replace the M68 steering column tilt motor.

• If within the specified range

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Steering Column Tilt Wheel and Telescope Switch Replacement Service and Repair

* Steering Column Tilt Wheel Actuator Replacement Service and Repair

* Steering Column Telescope Actuator Replacement Service and Repair

* Control Module References Control Module References for steering column position control module replacement, setup, and programming